tree db6c5dc53ab794b0637c37b287acc83d0cc6a90c
parent 48c96a5e621ba47ecfc7d8959be8981369505861
author David Crawshaw <crawshaw@golang.org> 1450564695 -0500
committer David Crawshaw <crawshaw@golang.org> 1452197672 +0000

gl: add a comment for linux installation

OpenGL ES is not installed by default on linux distributions, which
can lead to a cryptic error. Add a comment after the #include
mentioning what packages contain OpenGL ES on Ubuntu, which is
helpfully printed in the error message. For example:

	$ go build golang.org/x/mobile/example/basic
	# golang.org/x/mobile/gl
	In file included from ../../mobile/gl/work.go:21:0:
	work.h:6:117: fatal error: GLES2/gl2.h: No such file or directory
	 #include <GLES2/gl2.h> // install on Ubuntu with: sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev libx11-dev

Change-Id: Ia7ba583cee4dfdeed408f582b29da90de9a4fab3
Reviewed-on: https://go-review.googlesource.com/18058
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>